diff --git a/metatag.inc b/metatag.inc
index 0a57517..b1d0f56 100644
--- a/metatag.inc
+++ b/metatag.inc
@@ -56,7 +56,15 @@ class DrupalDefaultMetaTag implements DrupalMetaTagInterface {
   }
 
   public function getForm(array $options = array()) {
-    return array();
+    $form = array();
+    $form['allow_override'] = array(
+      '#type' => 'checkbox',
+      '#title' => t('Allow override'),
+      '#description' => t('Allow the parent configuration to override this one if the value is empty.'),
+      '#default_value' => isset($this->data['allow_override']) ? $this->data['allow_override'] : 0,
+      '#weight' => 20,
+    );
+    return $form;
   }
 
   public function getValue(array $options = array()) {
@@ -158,6 +166,7 @@ class DrupalDefaultMetaTag implements DrupalMetaTagInterface {
 class DrupalTextMetaTag extends DrupalDefaultMetaTag {
 
   public function getForm(array $options = array()) {
+    $form = parent::getForm($options);
     $options += array(
       'token types' => array(),
     );
@@ -281,6 +290,7 @@ class DrupalListMetaTag extends DrupalDefaultMetaTag {
   }
 
   public function getForm(array $options = array()) {
+    $form = parent::getForm($options);
     $form['value'] = isset($this->info['form']) ? $this->info['form'] : array();
 
     $form['value'] += array(
@@ -307,6 +317,7 @@ class DrupalListMetaTag extends DrupalDefaultMetaTag {
 class DrupalDateIntervalMetaTag extends DrupalDefaultMetaTag {
 
   public function getForm(array $options = array()) {
+    $form = parent::getForm($options);
     $form['value'] = array(
       '#type' => 'textfield',
       '#title' => t('@title interval', array('@title' => $this->info['label'])),
diff --git a/metatag.module b/metatag.module
index d30e3d0..7a54b7e 100644
--- a/metatag.module
+++ b/metatag.module
@@ -1036,10 +1036,29 @@ function metatag_metatags_view($instance, array $metatags = array(), array $opti
 
   $options['instance'] = $instance;
 
+  $overrides = array();
   foreach ($metatags as $metatag => $data) {
     if ((!empty($data['value']) || (isset($data['value']) && is_numeric($data['value'])))
       && $metatag_instance = metatag_get_instance($metatag, $data)) {
       $output[$metatag] = $metatag_instance->getElement($options);
+      // If overrides are allowed for this metatag and the metatag is empty,
+      // flag that we need to apply overrides.
+      if (empty($output[$metatag]) && !empty($data['allow_override'])) {
+        $overrides[] = $metatag;
+      }
+    }
+    // If overrides are allowed for this metatag, flag that we need to apply
+    // overrides.
+    elseif (!empty($data['allow_override'])) {
+      $overrides[] = $metatag;
+    }
+  }
+
+  // If there are any metatags that require overriding, do so.
+  if ($overrides) {
+    $instances = metatag_config_get_parent_instances($instance, TRUE, FALSE);
+    if ($instances) {
+      metatag_metatags_apply_overrides($output, $instances, $overrides, $options);
     }
   }
 
@@ -1050,6 +1069,48 @@ function metatag_metatags_view($instance, array $metatags = array(), array $opti
   return $output;
 }
 
+/**
+ * Handle applying parent instance overrides to metatags.
+ *
+ * @param array $output
+ *   The metatag output array.
+ * @param array $instances
+ *   The parent instances to get overriding metatags from.
+ * @param array $overrides
+ *   The metatag names that are to be overridden.
+ * @param array $options
+ *   The options to use to generate the metatags.
+ */
+function metatag_metatags_apply_overrides(&$output, $instances, $overrides, $options) {
+  // Get the instance we are currently interested in.
+  $instance = array_shift($instances);
+
+  // Get metatags for this instance.
+  $metatags = metatag_config_load_with_defaults($instance);
+
+  foreach ($overrides as $key => $metatag) {
+    $data = $metatags[$metatag];
+    if ((!empty($data['value']) || (isset($data['value']) && is_numeric($data['value'])))
+      && $metatag_instance = metatag_get_instance($metatag, $data)) {
+      $output[$metatag] = $metatag_instance->getElement($options);
+      // If we have a value or overrides aren't allowed at this level, remove
+      // them from the list of overrides.
+      if (!empty($output[$metatag]) || empty($data['allow_override'])) {
+        unset($overrides[$key]);
+      }
+    }
+    // If overrides aren't allowed at this level, remove them from the list of
+    // overrides.
+    elseif (empty($data['allow_override'])) {
+      unset($overrides[$key]);
+    }
+  }
+
+  if ($overrides && $instances) {
+    metatag_metatags_apply_overrides($output, $instances, $overrides, $options);
+  }
+}
+
 function metatag_metatags_values($instance, array $metatags = array(), array $options = array()) {
   $values = array();
 
@@ -1191,6 +1252,12 @@ function metatag_metatags_form(array &$form, $instance, array $metatags = array(
       $metatag_form['#access'] = $form['metatags']['#access'];
     }
 
+    // Wrap the form in a fieldset as it will likely contain multiple fields.
+    $metatag_form = array(
+      '#type' => 'fieldset',
+      '#title' => isset($metatag_form['value']['#title']) ? $metatag_form['value']['#title'] : '',
+    ) + $metatag_form;
+
     if (!empty($metatag_info['group'])) {
       $group_key = $metatag_info['group'];
       if (isset($info['groups'][$group_key]['label']) && !isset($form['metatags'][$langcode][$group_key])) {
@@ -1931,14 +1998,18 @@ function metatag_filter_values_from_defaults(array &$values, array $defaults = a
 /**
  * Return all the parents of a given configuration instance.
  *
- * @param $instance
+ * @param string $instance
  *   A meta tag configuration instance.
+ * @param array $include_global
+ *   Whether or not to include the global instance in the parents array.
+ * @param array $include_instance
+ *   Whether or not to include the given instance in the parents array.
  *
- * @return
+ * @return array
  *   An array of instances starting with the $instance parameter, with the end
  *   of the array being the global instance.
  */
-function metatag_config_get_parent_instances($instance, $include_global = TRUE) {
+function metatag_config_get_parent_instances($instance, $include_global = TRUE, $include_instance = TRUE) {
   $parents = array();
   $segments = explode(':', $instance);
   while (count($segments) > 0) {
@@ -1948,6 +2019,9 @@ function metatag_config_get_parent_instances($instance, $include_global = TRUE)
   if ($include_global && end($parents) !== 'global') {
     $parents[] = 'global';
   }
+  if (!$include_instance) {
+    array_shift($parents);
+  }
   reset($parents);
   return $parents;
 }